Method and apparatus for submarine signaling



R. A. FESSENDEN. METHOD ANDAPPARATUS FOR SUBMARINE SIGNALING.

I APPLICiA TIONflLED Now-"29.1 18. 1,348,821

' WJNIZENTOR,

' ATTORNEY.

Patented A112. 3.1920.-

uuirso s'rnrss rnrsur series.

REGINALD A. IESEIIDEN, F BRDGKLINE, MASSACHUSETTQ ASSIGNOR J0 SUBMA- RINE SIGNAL GOMPANY, 0:? PGRTLAND, MAINE, A CORIGRA'EION O METHOD AND APPARATUS FOR SUBIKARINE SIGNALING.

1 348 821 Specification of Letters Patent. 7 Patentgdjkng 3 goo- Amman men November as, 1918. sci-mi No. 264,607.

To all whom it magical/teem; The steel ring, 25, is held, preferably in Be it known that I, REGINALD A. Fnssnna slanting position with reference to the DEN, of Brookline', in the county of Norfolk ships skin, by means of the three struts l8 and Stateof .Massachusetts, a citizen of the 19, 20, the lower ends of these struts being 5 United States, have invented new and usefastened to the ships skin.

iul lniprovenientsin Methods and Appara- The arrangement is shown "from the side tus for Submarine Signaling, of which the in Fig. 2, following is the specification. The tube. l7. as shownin the left hand lily invention relates to submarine signalside of Fin. 2, has its outer end closed by 19 ing, and the generation, detectioinand utilia rubber cork or diaphragm. 21. to which so zationof impulses in fluid media, and more attached any suitable receiving device. for especially to methods of mounting submaexample, a number of nickel rod detectors. rine sound 'producers and detectors. ()ne of these rods is shown at 22. having My invention has for its object increased its inner end attached to a weight. 27. and efi'ieiency in submarine impulse production surrouinled by a coil, 28, whose terminals, and submarine impulse detection, and more 23. 241, are brought inside of the ship's skin particularly greater eificiencyin sending and as shown. receiving directly ahead andfastern, and This method and construction have a greater freedom from disturbance by undenumber of: important advantages. The ap- 2o sirednoises, for example. ship noises and paratus placed in this position is free from 79 water noises, 1 all danger of injury when the ship lies Figures 1 and 2 accompanying this applialongside a' dock. or grounds on a shore. cation show particularly diagrammatical Again. apparatus so arrangedand located is means suitable for carrying out my inveu- (apable of sending and receiving impulses tion, from ahead and astern, as Well as broad- I have found that by locating the appaside on, since it is not. in the shadow of rat-us for generating and receivingsubma the bow or the stern of the ship when rc-- rine impulses Within the area formed by the (towing from a, Sound source at a (l fi downwardprolongation of the ships side able distance ahead or astern, and never- (shown by the dotted line 12-13 in Fig. 1), theless in the sound shadow of the propeller so .the outward prolongation of the ships botnoises and may be shadowed if desired by tom (shown by the dotted line 13--14 in means of sound screens from internal hull Fig. 1) and the rounded portion of the ships vibrations or engine vib ations, such a soundskin lying between the ships side and the screen being shown at Si) in Fig. l.

35 ships bottom (shown by the full line 12-1 l- It has also the advantage that it is much in Fig. 1}, this increased eiliciency can be less-aife'cted by Water noises produced by obtained. I I I the relative motion between the ships skin The left hand side of Fig.1 shows one and the surrounding Water. suitable arrangement, Where 11. is the cross \Vhat I claim is:

-10 section of the ship, 15 is a bilge keel, placed In a submarine signalingsystem, the corn so in the area above referred to. and 16 is any bination of means for submarine signaling suitable generator of submarine impulses, and a ship's hull, said means being- Within for example, applicants oscillator. described the area bounded by the vertical prolong-- in U. S. Patent No. 1,167,366, dated Jan. tionof the ships side.the outward prolongaee 4, 1916. I 1 tion of the ships bottom, and the line join- The right, hand 'si'de'of Fig. 1 and F 2 ing' the lower extremity of the ships side shows anothersuit able arrangement, Where a to the outward extremity of the ships bottube, 17, ,i's held lira-ring of rubber or simitom. lar material, 26, and this again is held in,

60 a ring of steel or similar material, 25, REGINALD A. FESSENDEN, 

